Transcript
Page 1: Cosmic abundance (by number)

PX437 EXOPLANETS

Cosmic abundance (by number)

Element Abundance

(per 100,000)

Common molecules

H 92,700 H2

(He) 7,200

O 50 H20

(Ne) 20

N 15 NH3

C 8 CH4

Si 2Mg2SiO4

Mg 2

Fe 1 Fe3O4

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Condensation by temperature

Condensation temperature

Materials Examples

1400-1700 KCa Al Ti

compoundsAl2O3 CaTiO3

refractory elements

common elements

1300-1400 K Mg, Si compounds

Mg2SiO4

MgSiO3

1350 K metallic iron alloys

Fe

370 K magnetite Fe3O4

180 K water ice H20volatile

Elements130 K ammonia

hydrateNH3·H20

40-80 K methane, methane ices

CH4

CH4·7H20

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Migration

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Elemental abundance (by number)

Universe

Element Abundance

(per 100,000)

H 92,700

(He) 7,200

O 50

(Ne) 20

N 15

C 8

Si 2

Mg 2

Fe 1

Human body

Element Abundance

(per 100,000)

H 60,563

O 25,670

C 10,680

N 2,440

Ca 230

P 130

S 130

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Carbon-silicate cycle and climate stabilisation

Walker et al. 1981

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PX437 EXOPLANETSHabitable zones

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Earth spectrum

Selsis

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Detecting life?

Selsis 2007

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A search for life on Earth

Sagan et al, 1993, Nature 365, 715

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Vegetation Red Edge

Sagan et al, 1993, Nature 365, 715

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Earth transit transmission spectroscopy

Kaltenegger et al 2008

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PX437 EXOPLANETSDarwin, ESA

Page 13: Cosmic abundance (by number)

PX437 EXOPLANETSDarwin, ESA


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